Brilliant! My partner and I were predicting Adam Baldwin to guest star on Castle now that Chuck is finished. I bet it will be other episode you will have to closely watch for all of the Firefly references. I would be ecstatic if Adam wears a Blue Sun t-shirt in the episode.

I'm really looking forward to this. My ultimate fantasy Episode, though, would have the entire cast appear. To do that, They could have Castle help solve a mystery at a Sci Fi Convention. The "Captain" of a Space Opera is murdered, and the rest of the cast is suspected. A good twist would be to have Castle as a Guest at the Con, being chauferred to the event. We never see the Driver until the end, but his voice is familiar. At the conclusion, we get a reveal of Alan Tudyk as the driver of the Limo, with Dinosaurs on the dashboard. :D